Timing mechanism



R. M. G. PHILLIPS.

TIMING MECHANISM.

APPLICATION FILED OCT. 10. I9I9.

1,393,394. Patented 001. 11, 1921.

g UNITED "STATES PATENT OFFICE.

noss M. e. PHILLIPS, or NEW HAVEN, CONNECTICUT, AssIeNon TO THE PHILLIPS TIME swncn 00., or SHELTON,

CONNECTICUT, A CORPORATION.

' TIMING MECHANISM.

To aZZwlwm it may concern: Be it known that 1, Ross M. G. PHILLIPS v a citizen of the United States, residing'at and which said drawings constitute part of this applicationfand represent, in-

Figure 1 a face view of a timlng mechanism constructed in accordance with my in-- vention.

Fig. 2 is a rear view of the same.

Fig. 3 a sectional view on the line 33 of Fig. 2.v I

Fig. 4 a planv view of the main wheel,

' ratchet wheel and hub, detached.

Fig. 5 a perspective view of the friction washer, detached. 1.

Fig.6 a perspective view of the tension spring compressing nut detached.

This invention relates to an improvement in tini'ing mechanism adapted for various purposes wherein, certain mechanism is to be operated at a predetermined time. It

sometimes occurs that after a mechanism,

has been set to be operated at a'predetermined period, that it isdesirable to reset the timlng mechanism to shorten the predetermined period, but Where this has been done it has necessitated unwinding the spring to the extent to which the predetermined period has been shortened.

The object of this invention is to permit the resetting of the mechanism without effecting the spring, and'the invention consists in certain details of construction as will be hereinafter described and particularly recited in the claims.

Timing devices embodyin this invention may be used for a variety of purposes either in connection with cooking apparatus, signaling, or any purpose in which a timing mechanism may be employed.

In carrying out my invention as herein shown, I provide a main wheel '10 of a timing mechanism with a-hub 11,.which hub may be a part of the usual ratchet wheel 12 which is engaged by a pawl 13 held by a spring 14 in the usual. manner. Mounte'd in the hub is a pin 15 with which the inner Specification of Letters Patent.

Patented Oct. 11, 1921. Application fil ed October 10, 1919. Serial 1%.-3293555.

end of a clock spring 16 is attached, the

other end being connected with the clock movement in the usual manner. The ratchet wheel 12 with its hub and main wheel 10 is mounted upon an arbor 17 having a square portion 18 on which a cam 19 is mounted, th1s cam 19 being adapted to trip a lever 20 or other device for sired operation. The hub 11 is crowded against a collar 21 on the end of the arbor by means of a pressure spring-.22 bearing against a washer 23 connected with a shaft by providing it with a notch 24 for the reception of a pin 25 mounted in the arbor, the spring being compressed by a nut 26 turned onto the threaded portion 27 of the arbor which is mounted between the plates 28 and 29 of an ordinary clock movement including a train of ordinary clock-work gears. The arbor 17 is adapted to have a pointer 30 fixed to its outer end which may e secured-thereto by a screw 31, this pointer sweeping over a dial 32 fixed to a suitable case 33 in which the timing mechanism is mounted. The nut 26 is screwed onto the arbor 17' .so as to compress the spring 22 with sufiicient force to frictionally engage the washer 23 with the ratchetwheel 12 so that that ratchet wheel 12 and main wheel 10 will be turned by the actionof the spring .16. Turning the pointer 30 will wind the spring 16, but after the pointer has been turned to a predetermined point so as to cause the cam 19 to actuate the lever at a predetermined time .and it is desired to shorten that period, the pointer can be turned .back' and in so doing owing to the train of gearing the Washer 23 will slip on the ratchet wheel 12 so as not to turn that ratchet wheel and hence allow the dial-hand to be turned back and not unwind the spring. While I thus provide for windin the spring by the movement of the ban I also providefor the resetting of the hand without unwinding the spring, a very desirable feature in timing mechanisms;

I claim performing the de-,

1. In a timing mechanism including a train of gears, the combination with the winding arbor, of a hub mounted thereon, a main timing wheel, and a ratchet wheel connected with said hub, a main spring having one endconnected with the hub, a spring mounted on the arbor, and a nut also mounted on the arbor and adapted to'compress the said spring whereby the arbor may be turned backward without unwlnding the main spring. 2. In a tlmlng mechanism including a train of gears, the combination with the main arbor having a threaded portion, of a hub mounted thereon, a main timing Wheel, anda ratchet wheel connected with said hub, a main spring having one end. connected with said hub, a washer fixed to said arbor and bearing against the said ratchet, wheel, a nut mounted on the threaded portion of the arbor, a spring between said arbor and nut and adapted to be compressed by the nut, a cam mounted on said arbor, and means for turning said cam to predetermined positions.

3. In a timing mechanismv including a train of gears, the combination with the winding arbor, of a hub mounted thereon,

.a main timing wheel and a ratchet wheel connected with said hub, a main spring having one end connected w1th the hub, means mounted on the arbor for locking the arbor to the timing wheel, whereby the main spring may be wound by the arbor and the arbor turned backward without unwinding the main spring.

4. In a timmg mechanism, the combination with the winding arbor, of a hub mounted thereon, a main timing wheel and a ratchet wheel connected with the said hub, a main spring having one end connected with the hub, means mounted on the arbor for frictionally locking the arbor to the timing wheel, whereby the main sprin may be wound and the arbor turned bacfrwardi Without unwinding the main spring.

In testimony whereof, I have signed this specification in the presence of two subscribing Witnesses.

Ross M. e. PHILLIPS.

Witnesses:

FREDERIC C. EARLE, J. HAROLD FLYNN. 

